+Advanced Search
Home > Archive>Volume 31, Issue 2, 2012 >97-101
PDF HTML XML Export Cite reminder
Spin polarized transport through double quantum dots embedded in A-B ring coupled to ferromagnetic leads
CSTR:
[cstr]
Author:
Affiliation:

Department of Physics, Shanghai University,Department of Physics, Shanghai University,Department of Physics, Shanghai University

  • Article
    • | |
  • Metrics
    • |
  • Reference [12]
    • |
  • Related
    • |
  • Cited by
    • | |
  • Comments
    Abstract:

    The spin polarized transport through double quantum dots embedded in one arm of an A-B ring coupled to ferromagnetic leads has been studied in this paper. The Keldysh nonequilibrium Green function method is used to calculate the total tunneling current, the spin up current, the spin down current and the spin accumulation. The magnitude of them can be modulated by adjusting the polarization, the bias voltage and the magnetic flux in parallel and antiparallel configuration. With the spin-polarization strength P increasing, the total tunneling current decreases in both parallel and antiparallel configuration, and the tunneling for spin up and spin down electrons are different in two configurations. By tuning the magnetic flux, obvious interference between the two different paths can be observed. The spin accumulation in both QDs in antiparallel configuration is also investigated, and increases with the increase of P.

    Reference
    [1] Zhu J X, Balatsky A V. Josephson current in the presence of a precessing spin [J]. Phys. Rev. B, 2003, 67: 174505.
    [2] Sun Q F, Zhu Y, Lin T H. Writing spin in a quantum dot with ferromagnetic and superconducting electrodes [J]. Phys. Rev. B, 2004, 69: 121302.
    [3] Kobayashi K, Aikawa H, Katsumoto S, et al. Tuning of the Fano Effect through a Quantum Dot in an Aharonov-Bohm Interferometer [J]. Phys. Rev. Lett., 2002, 88: 256806.
    [4] Domanski T, Donabidowicz A, Wysokinski K I. Meservey-Tedrow-Fulde effect in a quantum dot embedded between metallic and superconducting electrodes [J]. Phys. Rev. B, 2008, 78: 144515.
    [5] Stefanski P. Proposal for a correlation induced spin-current polarizer [J]. Phys. Rev. B, 2008, 77: 125331.
    [6] Sergueev N, Sun Q F, Guo H, et al. Spin-polarized transport through a quantum dot: Anderson model with on-site Coulomb repulsion [J]. Phys. Rev. B, 2002, 65: 165303.
    [7] Barnas J, Rudzinski W, Swirkowicz R, et al. Spin effects in electron tunneling through a quantum dot coupled to noncollinearly polarized ferromagnetic leads [J]. Phys. Rev. B, 2005, 71: 205307.
    [8] Mu H F, Su G, Zheng Q R. Spin current and current-induced spin transfer torque in ferromagnet-quantum dot-ferromagnet coupled systems [J]. Phys. Rev. B, 2006, 73: 054414.
    [9] Trocha P, Barnas J. Quantum interference and Coulomb correlation effects in spin-polarized transport through two coupled quantum dots [J]. Phys. Rev. B, 2007, 76: 165432.
    [10]Yuan R Y, Wang R Z, Yan H. Spin-polarized transport in a coupled-double-quantum dot system with ferromagnetic electrodes [J]. J. Phys. Condens. Matter, 2007, 19: 376215.
    [11]Chen K W, Chang C R. Quantum interference and spin polarization on Rashba double quantum dots embedded in a ring [J]. Phys. Rev. B, 2008, 78: 235319.
    [12]Wu S Q. Spin-dependent transport through an Aharonov-Bohm ring with a quantum dot coupled to ferromagnetic electrodes [J]. Acta Phys. Sin., 2009, 58: 4175.
    Related
    Cited by
Get Citation

WANG Wu-Tao, XIN Zi-Hua, CHEN Si-Lun. Spin polarized transport through double quantum dots embedded in A-B ring coupled to ferromagnetic leads[J]. Journal of Infrared and Millimeter Waves,2012,31(2):97~101

Copy
Share
Article Metrics
  • Abstract:
  • PDF:
  • HTML:
  • Cited by:
History
  • Received:March 19,2011
  • Revised:December 24,2011
  • Adopted:May 06,2011
  • Online: April 23,2012
Article QR Code
You are the first Visitors
Governing Body：中国科学院
Organizer：中国科学院上海技术物理研究所，中国光学学会
Address：上海市玉田路500号 Phone：021-25051553
51La
Journal of Infrared and Millimeter Waves ® 2025 All Rights Reserved